4-Hydroxy-4a,8-dimethyl-3-methylene-3,3a,4,4a,7a,8,9,9a-octahydroazuleno[6,5-b]furan-2,5-dione 6754-13-8 AIDS-125803 AIDS125803 Ambrosa-2,11(13)-dien-12-oic acid, 6.alpha., 8.beta.-dihydroxy-4-oxo-, 12,8-lactone Helenalin NSC85236 PF 56 {Azuleno[6,} 5-b\]furan-2,5-dione, 3,3a,4,4a,7a,8,9,9a-octahydro-4-hydroxy-4a, 8-dimethyl-3-methylene-, {[3aS-(3a.alpha.,4.alpha.,4a.beta.,} 7a.alpha.,8.alpha.,9a.alpha.)\]-